June 8, 793. "Fiery dragons over Northumbria": Vikings sack Lindisfarne
The Anglo-Saxon Chronicle includes under 793 its famous reference to dire portents appearing over Northumbria, taking the form of immense whirlwinds and flashes of lightning, and "fiery dragons were seen flying in the air". These portents were followed by a great famine, and then the sack of Lindisfarne on June 8.